Process of mantis actubing felts



R.P. PERRY. PROCESS OF MANUFACTURING FELTS.

APPLICATION FILED 0CT.9| 19IT.

Patented M 24, 1919.

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To all whom it may concern Be it known that l, RAY P. PERRY, a citizentof the United States, residing at Upper Montclair in the county of Essex and State of New jersey, have invented certain new and useful Improvements in Processes of Manufacturing Felts, of which the following is a specification.

In my co-pending appllcation filed April 12, 1917, bearing Serial No. 161,670 and entitled Felts and processes of making the same, I have disclosed and claimed a proc-' see of manufacturing felts and the resulting ince the felt or paper contains already 1'ncorporated therein comminuted fusible waterproofing material, there is a tendency for the sheet to adhere to the heated rolls due to the slight fusion of the waterproofing material contained in the sheet in comm-muted form. This adherence of the sheet to the heated drying rolls is undesirable, not only because it has a tendency to render the sheet imperfect in parts, but also because the rolls after being in operation an appreciable length of time have a tendency to collect a substantial quantity of the waterproofing material, such material preventing the sheet to be dried from coming into intimate contact with the drying roll and in this way, and in other ways that are obvious, interfering with the most efficient operation of the drying rolls.

The ob]ect of my present invention is to provide means whereby the above disadvam tag-es may be avoided. By my process the drying of the wet sheet containing incorpoporated therein any desired amount of comminuted fusible waterproofing material, generally of a bitnous character, such as pitch or asphalt, and preferably in filamentary form, is accomplished, not by passing the sheet to be dried over and in contact with a serles of heated dryingrolls, but by sendlng the moist sheet into a gaseous drying medium, such as hot air or superheated steam, preferably contained within a large chamber or receptacle, where the drying takes place substantially out of contact with a highly heated solid surface. 7

Since the moist sheet generally possesses comparatively little mechanical strength, and since it would. otherwise have considera'ble tendency to warp, l have found it desir-able to give the sheet some mechanical support while the same is passing through the gaseous or vapor drying medium. Preferably this support is given by causing the sheet to be dried to be passed over an endless belt consisting of a material such as sheet metal having therein a large number of perforations, so that the gaseous drying medium may freely pass through the perforations and thereby come into contact with the side of the moist sheet, which is supported didectly against the said endless belt.

lleferring to the drawing wherein l have illustrated one form of device wherein my process may be carried out,

Figure 1 illustrates diagrammatically an apparatus wherein my process may be practised, and

Fig. 2 is a detail View of a portion of the endless supporting 'belt.

1 indicates the chamber or receptacle provided with the inlet 2 and the outlet 3 for the gaseous vapor drying medium, such as hot "air or superheated steam. The sheet 4 of moist'felt which is to be dried passes into the chamber 1 through the slot or aperture 5 near the upper portion thereof. The sheet 4 passes over the guide rolls 6 journaled in the -supporting member or frame 7 and is thereafter led on to the endless belt support ing member 8 which is supported upon the series of cylindrical members 9 provided with the gearor sprocket teeth 9 which serve as moving means for the endless belt. The

teeth 9' of the members 9 fit into the apertures 8' at the edges of'the endless belt 8. The endless belt 8 is furthermore provided with the perforations 8" scattered through out the width and length of the endless belt. In order to keep the sheet 4: against the perforated supporting member 8 during its passage through the chamber 1 there are provided the guide rolls 10, 10 preferably lollll cated opposite those points of the moving belt 8 at which the members 9 are positioned. After the sheet 4 which is by this time properly .dried leaves the last guide roll 10 it passes to the guide member 11 journaled in the frame or su port 12 and finally passes out of the sham er 1 through the aperture or slot 13. Any suitable means (not shown) may 'be employed for rotating the members 9, 9 thereby causing the movement of the belt 8 in the directions indicated by the arrows.

The operation of the above apparatus and the carrying out of my process therein are obvious from the description alreadyiven. The sheet 4 in its passage through the 0 amber 1 which is filled with a gaseous or vapor drying medium, such as hot air or superheated steam, entering the chamber 1 through the inlet 2, is thorou hly and speedily dried. The supporting mom or 8 which is provided with numerous perforations so that the area of contact between the same and the sheet to be dried is as small as possible, prevents the sheet 4: from becoming warped without, however, preventing free access of the drying medium to that surface of the sheet which is in contact With the member 8.

Throughout the claims wherever I refer to the term gaseous I mean "to include thereby vapor drying mediums as well.

What I claim is: p

1. The process of manufacturing felts and the like, which comprises the steps of forming a moist sheet of paper-making material containing incorporated therein fusible Waterproofing material in comminuted form, and thereafter passing the moist sheet through a heated gaseous drying medium.

2. The process of manufacturing felts and the like, which comprises the steps of forming a moist sheet of paper-making material containing incorporated therein fusible waterproofing material in comminuted form, and thereafter passing the moist sheet through a heated gaseous drying medium while supporting the sheet to prevent warping of the same.

3, The process of manufacturing felts and the like, which comprises the steps of forming a moist sheet of paper-making mate rial containing incorporated therein bituminous material in comminuted form, and

thereafter passing the moist sheet through a heated gaseous drying medium. Y

-4. The process of manufacturing felts and the like, which comprises the steps of forming a moist sheet of paper-making material containing incorporated therein bituminous material in comminuted form, and thereafter passing the moist sheet through a heated gaseous drying medium while sipporting the sheet to prevent warping of same 5. The process of manufacturing felts and the like, which comprises the steps of forming a moist sheet of paper-making material containing incorporated therein fusible waterproofing material in filamentary form, and thereafter passing the moist sheet through a heated gaseous drying medium.

6. The process of manufacturing felts and the like, which comprises the steps of forming a moist sheet of paper-making material containing incorporated therein fusible waterproofing material in filamentary form, and thereafter passing the moist sheet through a heated gaseous drying medium while supporting the sheet to prevent warping of the same.

7. The process of manufacturing felts and the like, which comprises the steps of forming a moist sheet of paper-making material containing incorporated therein bituminous material in filamentary form, and thereafter passing the moist sheet through a heated gaseous drying medium.

8. The process of manufacturing felts and the like, which comprises the steps of forming a moist sheet of paper-making material contained incorporated therein, bituminous material in filamentary form, and thereafter passing the moist sheet through a heated gaseous drying medium while supporting the sheet to prevent warping of the same.

9. The process of manufacturing felts and the like, which comprises the steps of form- .ing a moist sheet of paper-making material containing incorporated therein pitch filaments, and thereafter passing the moist sheet through a heated gaseous drying medium.

10. The process of manufacturing felts and the like, which comprises the steps of forming a moist sheet of paper-makingmaterial containing incorporated therein pitch filaments, and thereafter passing the moist sheet through a heated aseous drying medium while supporting t e sheet to prevent warping of the same.

In testimony whereof I afiix my signature.

RAY P. PERRY. 

